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1 Native Wetland, Riparian, And NATIVE WETLAND, RIPARIAN, AND UPLAND PLANT COMMUNITIES AND THEIR BIOTA IN THE WILLAMETTE VALLEY, OREGON Phase I Project: Inventory and Assessment Report to Environmental Protection Agency, Region X, Seattle, Washington Willamette Basin Geographic Initiative Program Jonathan H. Titus, John A. Christy, Dick VanderSchaaf, James S. Kagan, and Edward R. Alverson Oregon Natural Heritage Program, The Nature Conservancy Portland, Oregon November 1996 CONTENTS Abstract ............................................................................................................................................2 Summary...........................................................................................................................................2 Background of project.......................................................................................................................3 Methods........................................................................................................................................... 4 I. Data sources ......................................................................................................................4 II. Assessment of riparian and wetland vegetation...................................................................5 III. Mapping rare plants, animals, and plant communities ........................................................6 IV. Mapping presettlement vegetation.....................................................................................8 Results...............................................................................................................................................9 I. Mapping presettlement vegetation.......................................................................................9 II. Field inventory ................................................................................................................13 III. Changes since Euroamerican settlement ..........................................................................13 A. Changes in wetland, riparian, and other bottomland habitats .................................13 B. Changes in upland habitats...................................................................................17 IV. High-quality sites for protection and restoration...............................................................21 V. Recommendations...........................................................................................................26 Literature Cited ...............................................................................................................................29 Appendix A: Summary of sites inventoried ......................................................................................32 Appendix B: Mapping units and their respective plant communities...................................................38 Appendix C: Important sites in Willamette Valley not inventoried during this project..........................54 Appendix D: Topographic maps for which elements were digitized...................................................55 Appendix E: Sample element occurrence record for BCD................................................................56 Figure 1: Presettlement vegetation of the Willamette Valley ..............................................................57 Figure 2: High quality sites for protection and restoration ................................................................ 58 1 ABSTRACT As part of the Willamette Basin Geographic Initiative Program, the Environmental Protection Agency (EPA) funded The Nature Conservancy of Oregon to inventory, classify, and map native wetland and riparian plant communities and their threatened biota in the Willamette Valley. Between October 1994 and September 1996, we evaluated 172 wetland and riparian sites throughout the Willamette Valley. A site is a stream or river reach or wetland area that was inventoried at one to many locations. Of these sites, 21 are high-quality remnants important for future protection and restoration efforts. We identified 153 natural communities as occurring in native wetland and riparian habitats, of which 101 are new to the plant community classification of the Oregon Natural Heritage Program. Twenty-six species of rare animals and 23 species of rare plants occur in the Willamette Valley. Thirty-two species of rare plants and animals appear to be directly dependent on wetland and riparian communities in the Willamette Valley, and twenty-two species are dependent on upland upland communities in the Willamette Valley. Mapping of presettlement vegetation in the Willamette Valley indicates that 456,119 hectares (1,127,071 ac) of wetland and riparian habitat have been lost overall, with 12 communities impacted in particular. As for uplands, 732,432 hectares (1,809,841 ac) of habitat have been lost overall, with 7 natural communities impacted in particular. We recommend local citizen involvement, land purchases and restoration as means of protecting and restoring remnant ecosystems and their biota in the Willamette Valley. SUMMARY As part of the Willamette Basin Geographic Initiative Program, the Environmental Protection Agency (EPA) funded The Nature Conservancy of Oregon (TNC) to conduct an inventory and assessment of the Willamette Valley. TNC was asked to (1) inventory, classify, and map native wetland and riparian plant communities, (2) map rare native upland plant communities, and (3) map locations of rare plants and animals known to occur in the valley. Between October 1994 and September 1996, we evaluated 172 wetland and riparian sites throughout the Willamette Valley. Of these sites, 21 are high-quality remnants important for future protection and restoration efforts. We identified 153 native wetland and riparian communities, of which 101 are new to the plant community classification of the Oregon Natural Heritage Program. Twenty-six species of rare animals and 23 species of rare plants occur in the Willamette Valley. Thirty-two species of rare plants and animals appear to be directly dependent on wetland and riparian communities in the Willamette Valley, and twenty-two species are dependent on upland communities in the Willamette Valley. 2 Mapping of presettlement vegetation in the Willamette Valley indicates that 456,119 hectares (1,127,071 ac) of wetland and bottomland habitat have been lost since 1850, with 12 communities impacted in particular. As for uplands, 732,432 hectares (1,809,841 ac) of habitat have been lost, with 7 natural communities impacted in particular. For wetland communities, greatest losses since Euroamerican settlement have occurred in prairie, followed by bottomland forest, and then emergent wetlands. The greatest number of rare plants occur in wet prairie remnants, followed by emergent wetlands, and then bottomland forest. In contrast, the greatest number of rare wetland animals occur in emergent wetlands, followed by bottomland forest and prairie. For upland communities, greatest losses have occurred in savanna and prairie. The greatest number of rare upland plants and rare upland animals occurs in these habitats. We recommend local citizen involvement, land purchases, habitat restoration, and invasive species control as means of protecting and restoring natural ecosystems and biodiversity in the Willamette Valley. BACKGROUND OF PROJECT This project was conducted in order to gather information about the Willamette Valley to aid in the development of the Willamette Valley Conservation Plan. The Willamette Valley represents one of the most threatened ecoregions in Oregon. This Phase I Project is a much needed project that has the potential to promote integrated efforts on a wide range of activities in the basin that have at their core the conservation of aquatic and terrestrial related natural resources. The Willamette Valley was dominated by extensive and diverse riparian and wetland plant communities during presettlement times in the early 1800's (Johannessen et al. 1971). Settlement of the Willamette Valley, the endpoint of the Oregon Trail, brought dramatic changes to the landscape as it was cleared for pasture and drained for agricultural purposes (Boag 1992). Now only about 10% of the Willamette Valley remains in relatively natural vegetative communities. The Willamette Valley also became home to over two-thirds of the state=s population by the end of the 1980's. Finally, the streams and rivers which drained into the Willamette Valley have changed significantly since presettlement times, with flood control dams and stream channelization projects resulting in a vastly different hydrologic regime than previously existed for the Willamette drainage (Seddell and Froggatt, 1984). Nevertheless, in the face of extensive alteration of natural habitats, there remain examples of natural communities and populations of rare and threatened species. These occurrences, and the open spaces of the valley, are prime attractions to the human population there who desire increased connection to the outdoors for recreation and renewal. Maintaining biodiversity and restoring sites 3 critical for conservation is as necessary for the long term livability of the Willamette Valley as it is for the long term survival of the species native to the ecoregion. METHODS I. Data Sources Information for this project was obtained from (1) preexisting data housed by the Oregon Natural Heritage Program, originating from multiple sources, including field inventory by staff,
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